package com.rzjm.api.netty;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.timeout.IdleStateEvent;
import io.netty.util.CharsetUtil;
import org.springframework.stereotype.Component;

@Component
public class HeartBeatHandle extends ChannelInboundHandlerAdapter {

    private static final ByteBuf HEARTBEAT_SEQUENCE =
            Unpooled.unreleasableBuffer(Unpooled.copiedBuffer("HEARTBEAT", CharsetUtil.UTF_8));

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        if(evt instanceof IdleStateEvent) {
            // 发送心跳到远端
            ctx.writeAndFlush(HEARTBEAT_SEQUENCE.duplicate()).addListener(ChannelFutureListener.CLOSE_ON_FAILURE);    // 关闭连接
            SocketPool.autoDelChannel();
        } else {
            // 传递给下一个处理程序
            super.userEventTriggered(ctx, evt);
        }
    }
}
